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Photoplethysmographic Diagnosis for Marginal Periodontitis

Research Project

Project/Area Number 62870075
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field Conservative dentistry
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

HORIUCHI Hiroshi  Tohoku Univ. Sch. of Dentistry, Professor, 歯学部, 教授 (00013962)

Co-Investigator(Kenkyū-buntansha) YAMAKI Keiko  Tohoku Univ. Sch. of Dentistry, Assistant, 歯学部, 助手 (90182419)
IKAWA Motohide  Tohoku Univ. Sch. of Dentistry, Assistant, 歯学部附属病院, 助手 (80176065)
Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 1989: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1988: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1987: ¥5,300,000 (Direct Cost: ¥5,300,000)
KeywordsPhotoplethysmograph / Gingival Blood Flow / Marginal Periodontitis
Research Abstract

Gingival inflammation accompanies disorder of local circulation. Therefore there exists a possibility for detecting inflammatory condition by observing gingival blood flow. The purpose of this study is to establish a method to record the photoplethysmographs from small gingival areas and to estimate gingival inflammatory stages by comparing the wave forms with those from normal area.
Preliminary investigations were carried out to determine conditions for recording. A tungsten lamp connected to a stabilized power supply was used as the light source. A fiber optic bundle of 2 mm diameter was fixed to the adjacent tooth using an acrylic adapter. The bundle consisted of illuminating and recording fibers which were arranged randomly. A CdSe photoconductive cell was used as the photosensor. Simultaneous recording of the ECG was made and the recorded QRS spikes were used as the triggers for averaging the record. To record transilluminated plethysmographs, the outlet of the illuminating bundle was arranged lingually. In case of reflected photoplethysmographs, both the recording and illuminating fibers were placed tabially.
When the bundle was placed close to the gingiva, dicrotic notches were cleatly observed both on transilluminated and reflected plethysmographs. Covering the surface of gingiva with white opaque paint resulted almost the same wave forms as transilluminated ones in reflected photoplethysmographs. To reject the 100 Hz noise from fluorescent lights at clinic, a sheet of aluminum foil was used around the recording site.
Experiments were in progress to analyze the characteristics of photoplethysmographs recorded from inglamed gingiva and to relate the findings to other periodontal diagnostic parameters.
The photoplethysmographs recorded from patients with marginal perjodontitis were smaller amplitude with less clear dicrotic notches than those recorded from normal gingiva.

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 井川資英,八巻恵子,鈴木敬子,大沼美和子,堀内博: "ヒト歯肉微小領域より得られる光電脈波" 日本歯周病学会会誌. 32. 205-212 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Motohide IKAWA, Keiko YAMAKI, Noriko SUZUKI, Miwako OONUMA and Hiroshi HORIUCHI: "Photoplethysmograph Obtained from a Small Area of Human Gingiva" J. Japan. Ass. Periodont. vol.32 no.1 205-212.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 井川資英、八巻恵子、鈴木敬子、大沼美和子、堀内博: "ヒト歯肉微小領域より得られる光電脈波" 日本歯周病学会会誌. 32. 205-212 (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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